/// <summary>
/// 删除一个目录项
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public Boolean Delete(String name)
{
if (!Contains(name))
{
return(false);
}
if (name == "." || name == "..")
{
return(false);
}
var inodeIndex = entries[name];
INode inode = INode.Load(vfs, inodeIndex);
if (inode.IsDirectory())
{
// 删除非空目录项:递归删除
INodeDirectory id = INodeDirectory.Load(vfs, inodeIndex);
if (id.Size() > 2)
{
var l = id.List();
foreach (var pair in l)
{
id.Delete(pair.Key);
}
}
}
inode.data.linkCount--;
if (inode.data.linkCount == 0)
{
inode.Resize(0);
vfs.DeAllocateINode(inode.index);
}
else
{
inode.Save();
}
entries.Remove(name);
Save();
return(true);
}
public File(VFSCore vfs, String path, FileMode fileMode)
{
this.vfs = vfs;
var directory = VFS.GetPathDirectory(path);
var name = VFS.GetPathName(path);
VFS.AssertNameValid(name);
INodeDirectory dir = INodeDirectory.Resolve(vfs, directory);
if (dir == null)
{
throw new Exception("无法访问目录");
}
switch (fileMode)
{
case FileMode.CreateNew:
if (dir.Contains(name))
{
throw new Exception("文件已存在");
}
CreateFile(dir, name);
break;
case FileMode.Create:
if (dir.Contains(name))
{
OpenFile(dir, name);
inode.Resize(0);
}
else
{
CreateFile(dir, name);
}
break;
case FileMode.Open:
if (!dir.Contains(name))
{
throw new Exception("文件未找到");
}
OpenFile(dir, name);
break;
case FileMode.OpenOrCreate:
if (dir.Contains(name))
{
OpenFile(dir, name);
}
else
{
CreateFile(dir, name);
}
break;
case FileMode.Truncate:
if (!dir.Contains(name))
{
throw new Exception("文件未找到");
}
OpenFile(dir, name);
inode.Resize(0);
break;
case FileMode.Append:
if (!dir.Contains(name))
{
CreateFile(dir, name);
}
else
{
OpenFile(dir, name);
position = inode.data.sizeByte;
}
break;
default:
throw new ArgumentException();
}
}